特殊对接形式下SiCP/Al复合材料与铝合金搅拌摩擦焊的组织与力学性能
Microstructure and mechanical properties of dissimilar barrier butt joints of AA6061/SiC/55p to AA2024 in friction stir welding
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摘要: 采用搅拌摩擦焊,对特殊对接形式下比分为55%(体积分数)的SiCP/Al复合材料与2024铝合金进行了异种材料焊接,研究了焊缝的组织特征及力学性能特点. 结果表明,轴肩影响区的前进侧存在大量细小的SiC颗粒,其分布呈带状;WNZ1的组织沿焊缝厚度方向上存在变化;WNZ2下部被SiC颗粒包围的铝合金晶粒尺寸有长大趋势;结合线处搅拌工具脱落颗粒会影响材料的结合. 在旋转速度为750 r/min时,获得了较高的焊缝强度,为复合材料母材强度的83.1%,接头的断裂机制为复合材料基体自身的断裂及其与SiC颗粒的脱粘.Abstract: Dissimilar barrier butt joints of SiC particles reinforced aluminum matrix composites with a volume fraction of 55% to 2024 aluminum alloy were fabricated by friction stir welding. Investigation of microstructure and mechanical properties of the joint was conducted. Results show that, a large amount of small SiC particles, with a strip-shaped distribution, was found in the advancing side in SAZ. Microstructure features of the weld in direction of weld thickness changed a lot in WNZ1, which at the lower side was the interval distribution of large SiC particles riched bands and small SiC particles riched bands. Grain size of the upper side was larger than that of the lower side in WNZ2, while grains surrounded by SiC particles were prone to grow larger. Bonding level of the material was different in different locations in IZ, which was affected also by debris fallen from the welding tool. A higher tensile strength was obtained in rotational speed of 750 r/min, 83.1% that of the composite base material. Fracture mode of the joints was detected to be the the matrices fracture and matrices segregation to SiC particles.
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